炼钢流程钢中氮的溶解及控制技术

Nitrogen dissolution and control of molten steel in steelmaking process

氮作为钢中典型的常存元素,其含量对钢产品性能有重要影响。炼钢生产过程中,由于钢液裸露容易导致增氮,或者钢液成分不同、操作不当等使含氮合金中氮的收得率不稳定等,这些因素都会使钢液中的氮含量产生明显波动,导致成品钢材性能不稳定。因此,氮的精准控制已成为控氮钢种或含氮钢种生产中的关键问题,分析了钢中氮的来源,阐释了钢液氮溶解热力学和动力学,综述了炼钢生产流程中钢液氮变化、控氮研究现状及技术措施等,提出炼钢流程中钢液氮精准控制发展方向。

As a typical coexistence element in steel,the content of nitrogen has an important influence on the properties of steel products.In the process of steelmaking,the nitrogen content in molten steel fluctuates obviously,which leads to unstable properties of finished steel,because the exposed molten steel easily leads to nitrogen increase,or the yield of nitrogen in nitrogen-containing alloy is unstable due to different compositions of molten steel and improper operation.Therefore,the precise control of nitrogen has become a key issue in the production of nitrogen-controlled steel or nitrogen-containing steel.The sources of nitrogen,the thermodynamics and kinetics of nitrogen dissolution in molten steel were analyzed,the changes of nitrogen in molten steel production process,the research status and technical measures of nitrogen control were summarized,and the development direction of precise control of nitrogen in steelmaking process puts forward.